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Dragging Pumping Unit with Outer-Rotor adopts new patent of utility model (pumping unit ZL 03242883.9 with torque of outer-rotor ，and ZL 200710089285.0 W dragging pumping unit), the new pumping unit is a combination of electric and machinery with the features of energy-saving, carbon emission reduction, and high efficiency. Its innovation point is to take technologies of outer-rotor motor and converter control, which are both up-to-date in the world.

Specification of the Pumping Unit with the Outer-rotor Motor

Performance and Features of the Dragging Pumping Unit with Outer-Rotor Motor

1. Compact structure, less weight, and taking smaller space

The main components of the pumping unit are outer-rotor motor and converter device, comparing with the traditional floating beam pumping unit, it omits the complicated mechanic system of gear box for speed reduction and commutator, and therefore it features as compact structure, less weight and taking smaller space.

• Obvious Electricity-saving feature

As the up-to-date magnate synchronous motor with outer-rotor and advanced converter control technologies are adopted, and by means of direct balance, in the dragging system, pulley is adopted to reduce the load of motor; therefore, the electricity-saving feature is obvious.

•  Infinite regulation of stroke and stroke frequency with multiple protection functions 

With the technology of converter control, it can realize infinite regulation over stroke and stroke frequency, and is enabled with phase-missing protection function, over-load protection function, lose load protection function and motor over-heat protection function, automatic turn-off protection function in case of short-circuit.

    4、Easy operation, and easily adjusting specifications

The stroke frequency is controlled via adjusting the rotary buttons on the panel of the converter, while the stroke is adjusted via changing the positions of the upper sensor and lower sensor; the balance of the pumping unit is adjusted via changing the weight of the balance block. All of these realized the features of easy operation and easy adjustment of specification.

    5、 With the features of long distance stroke, low stroke frequency, it is suitable for crude oil drilling of thick oil well, forced drilling well with big pump, and deep oil well.

    The outer-rotor of the pumping unit has the features of high torque, low speed, to realize long distance stroke with low stroke frequency. In case of rated suspending point load of 160, and max stroke of 7m, the max stroke frequency can reach to 3 min-1, therefore it is suitable for crude oil drilling of thick oil well, forced drilling well with big pump, and deep oil well.